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Novel mixer suitable for mixing high-viscosity fluid

A fluid mixing and mixer technology, used in fluid mixers, mixers, chemical instruments and methods, etc., can solve the problems of high cost, high pressure drop, long time and channel length, etc., to increase disturbance and reduce flow resistance. , the effect of lengthening

Active Publication Date: 2022-07-29
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, under microscopic conditions, for high-viscosity fluids, if only relying on the diffusion process for mixing, it takes a considerable time and channel length, resulting in high pressure drop and high cost

Method used

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  • Novel mixer suitable for mixing high-viscosity fluid
  • Novel mixer suitable for mixing high-viscosity fluid
  • Novel mixer suitable for mixing high-viscosity fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: CFD calculation simulates the effect of mixer baffle cycle number N on mixing

[0031] like Figure 1 to Figure 3 As shown, the novel mixer suitable for mixing high viscosity fluids includes an outer pipe 1 and a "comb"-shaped built-in baffle 2 located in the outer pipe; the outer pipe 1 includes two inlets, an outlet and a mixing channel. .

[0032] Among them, the built-in baffles 2 are arranged periodically along the axial direction of the pipeline, and the two sides of each baffle are fixedly connected with the inner wall of the mixing channel; The other side is provided with a comb-tooth-shaped through groove;

[0033] figure 1 A schematic cross-sectional view of the mixer structure is given, in which (a) is a three-dimensional cross-sectional view of the mixer, and (b) is a two-dimensional cross-sectional view of the mixer.

[0034] figure 2 A top view of the periodic arrangement of the built-in baffles 2 is given. The mixing channel is arranged ...

Embodiment 2

[0037] Example 2: Application of Reactor—CFD Computational Simulation to Prepare Biodiesel

[0038] Select the size of the reactor: the outer diameter is 17mm, the inner diameter is 16mm, the length of the mixing channel is 250mm, the built-in "comb" baffle has 4 comb teeth, the length of the comb teeth is 11mm, the width is 1mm, and the thickness is 4mm. The radius of one side of the arc is 8mm, the baffle spacing is 2.5mm, ∠α 1 =∠α 2 =30°, the number of baffle periods is 3. The mixer was numerically calculated with ANSYS software, and the three-dimensional model of the mixer was imported into fluent in Workbench for simulation. Under the condition of Reynolds number Re=81.4, the density of soybean oil is selected as 894.1kg·m -3 , the density of methanol is 755kg m -3 , the diffusion coefficients are both 8.13×10 -10 m 2 ·s -1 , the viscosity is 17.5mPa s, the inlet flow velocity is 0.05m s -1 . Get the mixed effect diagram as Figure 5 (a), the mixing efficiency at ...

Embodiment 3

[0039] Example 3: Application of Reactor—CFD Computational Simulation to Prepare Biodiesel

[0040] Select the size of the reactor: the outer diameter is 17mm, the inner diameter is 16mm, the length of the mixing channel is 250mm, the built-in "comb" baffle has 4 comb teeth, the length of the comb teeth is 11mm, the width is 1mm, and the thickness is 4mm. The radius of one side of the arc is 8mm, the baffle spacing is 2mm, ∠α 1 =∠α 2 =30°, the number of baffle periods is 3. The mixer was numerically calculated with ANSYS software, and the three-dimensional model of the mixer was imported into fluent in Workbench for simulation. Under the condition of Reynolds number Re=8.6, the density of soybean oil is selected as 894.1kg·m -3 , the density of methanol is 755kg m -3 , the diffusion coefficients are both 8.13×10 -10 m 2 ·s -1 , the viscosity is 200mPa s, the inlet flow velocity is 0.06m s -1 . Get the mixed effect diagram as Figure 5 (b), calculate the mixing effici...

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Abstract

The invention discloses a novel mixer suitable for high-viscosity fluid mixing. The mixer is composed of an outer pipeline and a mixing channel built-in baffle structure. The outer pipeline is composed of two inlets, an outlet and a mixing channel, and the built-in baffle structure is composed of a plurality of repetitive units in a periodic array. The baffle structure of the mixing channel can change the motion trail of the fluid, the laminar flow state of the fluid is broken, and the mixing and mass transfer process of the fluid in the channel is further strengthened; different mixing effects of the fluid can be obtained by changing the length of the mixing channel of the mixer and the structural parameters of the baffle, and efficient mixing of the fluid is achieved within a short time. The mixer is suitable for a liquid-liquid mixing process with the viscosity of 1-200mPa. S, has the advantages of simple structure, convenience in processing and the like, and has a wide application prospect in the field of micro-chemical equipment.

Description

technical field [0001] The invention relates to microchemical equipment, in particular to a passive mixer for high-viscosity fluids. Background technique [0002] The development of microchannel reactor equipment has provided new ideas in chemical reaction engineering, characterized by extremely high surface-to-volume ratios that exhibit enhanced heat and mass transfer rates; achieved by simple replication of microreactor units High-throughput scale-up, which eliminates expensive reactor redesigns and pilot plant experiments, shortens the development time from laboratory to commercial production. [0003] The fluid in the micromixer needs to pass through micron-scale micropores or microchannels, and the high flow resistance in these channels limits the mixing effect. In order to use the basic principle of micro-mixing to realize the mixing of high-viscosity fluids, it is necessary to maintain the micron-scale dispersion and transfer scale on the one hand, and reduce the flo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01F33/30B01F25/431B01F23/47B01J19/00
CPCB01J19/0093
Inventor 郭凯韦依敏赵双飞何伟咸漠
Owner NANJING UNIV OF TECH
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